// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_TOUCHPAD_PINCH_GESTURE_H_
#define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_TOUCHPAD_PINCH_GESTURE_H_

#include "base/macros.h"
#include "base/time/time.h"
#include "content/browser/renderer_host/input/synthetic_gesture.h"
#include "content/browser/renderer_host/input/synthetic_gesture_target.h"
#include "content/common/content_export.h"
#include "content/common/input/synthetic_pinch_gesture_params.h"
#include "content/common/input/synthetic_web_input_event_builders.h"
#include "third_party/WebKit/public/platform/WebInputEvent.h"

namespace content {

class CONTENT_EXPORT SyntheticTouchpadPinchGesture : public SyntheticGesture {
public:
    explicit SyntheticTouchpadPinchGesture(
        const SyntheticPinchGestureParams& params);
    ~SyntheticTouchpadPinchGesture() override;

    SyntheticGesture::Result ForwardInputEvents(
        const base::TimeTicks& timestamp,
        SyntheticGestureTarget* target) override;

private:
    enum GestureState { SETUP,
        STARTED,
        IN_PROGRESS,
        DONE };

    void ForwardGestureEvents(const base::TimeTicks& timestamp,
        SyntheticGestureTarget* target);

    void UpdateTouchPoints(const base::TimeTicks& timestamp);

    void CalculateEndTime(SyntheticGestureTarget* target);
    float CalculateTargetScale(const base::TimeTicks& timestamp) const;
    base::TimeTicks ClampTimestamp(const base::TimeTicks& timestamp) const;
    bool HasReachedTarget(const base::TimeTicks& timestamp) const;

    SyntheticPinchGestureParams params_;
    SyntheticGestureParams::GestureSourceType gesture_source_type_;
    GestureState state_;
    base::TimeTicks start_time_;
    base::TimeTicks stop_time_;
    float current_scale_;

private:
    DISALLOW_COPY_AND_ASSIGN(SyntheticTouchpadPinchGesture);
};

} // namespace content

#endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_TOUCHPAD_PINCH_GESTURE_H_
